Good question, one I have been asking since day 1 of the iPhone. Security is all I can think of. But every other bluetooth enabled phone on the market for the last 10 years? has been able to do it. I'd think Apple could make it secure.

It goes along with replaceable batteries. Why can't we buy a spare and replace our own?

My best guess would be Apple form and function - The new MBA would be a good example, for Apple to get it so thin and ridged. Now add in access doors for batteries and release devices for the batteries, all could add weight and increase size of the chassis ? ? Plus it keeps Bone Heads out side

Plus like with the iPhone you can buy extra batteries that simply plugs in at the bottom.

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